Centrifugal speed-regulator for phonographs.



v A PARNALL.

CENTRIFUGM SPEED REGULATOR FOR PHONOGRAPHS.

APPLICATION HLED APR. 12. 1915.

Patenied May 14, 1918.

' shaft 20 journaled in the UNITED STATES PATENT onrion ARCHIE E.PARNALL, OF CHICAGO, ILLINOIS, ASSIGNOR T0 FRANK W. WILLIAMS, 0]?

. CHICAGO, ILLINOIS.

GENTBIFUGAL SPEED-REGULATOR FOR PHONOGRAPHS.

Application filed April 12, 1915.

To all whom it may concern:

Be it known that I, ARCHIE E. PARNALL, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented new and useful Improvements in Centrifugal Speed-Regulators forPhonographs, of which the following is a full, clear, concise, and exactdescription, reference being had to the accomformlng a part of th1spanying drawing, specification. I

My invention relates to phonographs and more specifically toimprovements in the means for controlling the starting and stop. pingand speed of the record support.

ong the objects of my invention is to provide such means which will besimple in construction and efficient in use, and in which the same leverwhich controls the starting and stopping of the record support is alsoused in controlling the speed.

Further objects will appear from the detailed description to follow andthe appended claims.

In the drawing, in which I have illustrated one embodiment of myinvention- Figure 1 is aplan view of a phonograph showing thecontrolling lever and the adjustable stop;

Fig. 2 is a vertical section substantially on the line 22 of Fig. 1,showin the governing mechanism and the control and the connectionstherebetween; and

Fig. 3 is a section substantially on the line 3-3 of Fig. 2 showing thedriving and transmission mechanism and the governing mechanism.

Referring now to the drawing in detail the parts of the phonograph showncomprise the casing or cabinet 10 havin a top 11, side walls 12, a base13, the cIr-iving and transmission mechanism indicated in general at 14,the governing mechanism indicated at 15, and the starting, stopping andspeed controlling mechanism indicated at 16..

The driving, transmission and governing mechanism is supported by andbetween two plates 17 and 18 (Fig. 2), which plates are connectedtogether and supported from the top 11 of the casing by means of threeupright posts 19. The driving and transmission mechanism comprises avertical lates 17 and 18, a pinion 21 secured to the s aft 20 and drivenfrom any suitable source of power, such as Specification of LettersPatent.

on the upper end of the ing lever,-

Patented May 14, 1918. Serial N 0. 20,863.

a spring motor (not shown),

meshing with a pinion 23 which is secured on a vertical shaft 24journaled in the plates 17 and 18. The upper end of the shaft 24 extendsthrough an opening 25 in the top 11 of the casing and has securedthereto the record support indicated in dotted lines at 26 (Figs. 1 and2), on which the record, indicated at 27, rests. A spur gear 28 issecured to the shaft 24 and meshes with a pinion 29 which is secured onthe governor shaft 30 which is mounted in suitable bearings on theplates 17 and 18. A collar 31 (Fig. 2) is secured shaft 30 by means of aset screw 32. Spring strips 33 are secured at their upper endsto thecollar 31 and at their lower ends to a collar 34 which is slidablymounted on the governor shaft 30. Weights 35 are secured to the springs33 intermediate their lengths. A friction brake disk 36 is secured tothe collar 34 to slide therewith and is engaged by a brake shoe 37 whichmay be a felt punching, secured to one arm 38 of a bell crank lever 39which is mounted on a bracket 40, secured to the plate 18, by means of ascrew 41 extending through the bracket and lever. The

other arm 42 of the lever 39 extends upwardly through the opening 25 andinto an opening 43 in thelink44 which is adjustably secured to the lever45 by means of a wing nut 46 which engages a threaded memer extendingthrough the slot 47 in the link 44. The lever 45 is pivotally mounted onthe top 11 of the casing in any suitable manner as by means of a screw48 extending through an opening in the lever and into the tog 11 of thecasing.

' he movable end of the lever 45 extends through a slot or opening 49 ina bracket or keeper 50 which 1s secured to the top 11 by means of screws51. The slot 49 has an off-set portion 52 with which the end of thelever 45 engages when it is moved to the extreme left, the lever 45being constructed of resilient material and the tension in the leverbeing such as to tend to hold the end of the lever up in the off-setportion 52. The lever 45 has a projection 53 which is used ,as a pointerand also engages an adjustable pitch and tempo spiral face or edgeportion with which the projection 53 engages. Graduations 58 areprovided adjacent the spiral edge 57 for cooperation with the pointer53. The phonograph is provided with the usual handle 59 for winding upthe spring and with the usual tone arm, the base of which is indicateddiagrammatically at 60.

The use and operation of my device is as follows: Assuming that thelever is in its left hand'position and that its end is engaged withinthe off-set portion 52 of the slot, the friction between the brake shoe.3? and the brake disk 36 will be so great that the motor will not beable to drive the record support. The adjustable stop 54 is then set togive the desired time and pitch to the selection to be played bymanipulating the thumb piece 56 and observing the graduations 58 and thepointer 53. The end of the lever a5 is then pressed down to release itfrom its engagement within the ofi-set portion 52 of the slot and thelever is then moved to the right until the projection 53 comes intoengagement with the spiral edge or face 57 oi the adjustable stop 54.lhis movement of the lever 45 raises the brake shoe Bland permits themotor to rotate the record support and also the governing mechanismuntil the weights 35 on the governing mechanism fly out sufficientlyagainst the tension of the springs 33 to lift the friction plate 36 upagainst the brake shoe 3'? with suficient force to maintain the speed ofthe governor, and consequently the record support, constant.

it will be seen that the speed at which the phonograph will run willdepend on the height to which the brake shoe 37 is lifted which, inturn, will depend upon the distance to which the lever i5 is moved tothe right, and that this distance will depend on the position of theadjustable stop 5%. After the stop 51 has been set to give the desiredthe phonograph can be and-started again as often as destopped the siredand will always come baclr to same pitch and tempo.

The adjustable connection between the link and the lever is is providedto take up the wear on the parts such as the wear brclre shoe and thefriction between the will be device in 1 and speed by means or ima esnections with the governing device, and means are provided whereby afterthe desired pitch and tempo have been provided for the machine maybestopped and started as often as desired and will always come back tothe desired pitch and tempo.

Having thus described my invention what I claim as new and desire tosecure by I Letters Patent is 1. A phonograph comprising movable speedcontrolling means accessible for manual operation and movable to aposition to stop the phonograph, and an adjustable stop for said speedcontrolling means, said stop having a spiral face for engagement withsaid speed controlling means.

2. A phonograph comprising movable speed controlling means accessiblefor manual operation and movable to a position to stop the phonograph,and a rotatable adjustable stop for said speed controlling means.

3. A phonograph comprising a movable speed controlling means accessiblefor manual operation and movable to a position to stop the phonograph,and an adjustable stop for said speed controlling means, said meanshaving a projection thereon for engagement with said stop.

l. A phonograph comprising a movable speed controlling means accessiblefor man ual operation and movable to a position to stop the phonograph,and an adjustable stop for said speed controlling means, said stophaving a spiral portion, and said means having a projection thereon forengagement with said spiral portion.

5. A phonograph comprising movable speed controlling means accessiblefor manual operation and movable to a position to stop thephonograph,and an adjustable stop for said speed controlling means, saidstop comprising a flat member having a spiral edge for engagement withsaid speed controlling means.

6. A phonograph comprising movable speed controlling means accessiblefor manoperation and movable to a position to stop the phonograph, andan adjustable stop for said speed controlling means, said stopcomprising fiat member having a spiral 3 with said speed conthumb piecefor adl have hereunto sub-

